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OpenVZ Notes

OpenVZ Notes

Warning
Creating a template
Tip re. freenx-server
Updating template
Create configuration template for 10 vms
Create new vm
Other tricks
Removing a vm
List running and non-running
Memory use

Check memory usage for guest 103
Set minimum memory 256 x memory wanted
Set maximum memory 256 x memory wanted

References

Warning

This is just an aide-memoire, please don't try and follow it.

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Creating a template

# rm -f /etc/ssh/ssh_host_*
cat << EOF > /etc/rc2.d/S15ssh_gen_host_keys
#!/bin/bash
ssh-keygen -f /etc/ssh/ssh_host_rsa_key -t rsa -N ''
ssh-keygen -f /etc/ssh/ssh_host_dsa_key -t dsa -N ''
rm -f \$0
EOF
# chmod a+x /etc/rc2.d/S15ssh_gen_host_keys

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Tip re. freenx-server

You will need to reconfigure the freenx-server:

$ sudo dpkg-reconfigure freenx-server

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Updating template

$ sudo vzctl enter XXX
$ sudo apt-get clean
$ exit
$ sudo vzctl set XXX --ipdel all --save
$ sudo vim /var/lib/vz/private/XXX/etc/resolv.conf
$ sudo rm -f /var/lib/vz/private/XXX/etc/hostname
$ sudo vzctl stop XXX
$ cd /var/lib/vz/private/XXX
$ tar --numeric-owner -zcf /var/lib/vz/template/cache/debian-5.0-i386-minimal.tar.gz .

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Create configuration template for 10 vms

$ sudo vzsplit -n 10 -f vps.tenth

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Create new vm

sudo vzctl create XXX --ostemplate debian-5.0-i386-minimal --config vps.basic
sudo vzctl create XXX --ostemplate debian-5.0-i386-kde --config vps.tenth
sudo vzctl start XXX
sudo vzctl set XXX --ipadd 192.168.0.XXX --save
sudo vzctl set XXX --nameserver 192.168.0.254 --save
sudo vzctl set XXX --onboot yes --save
sudo vzctl set XXX --hostname server-XXXXXX.example.co.uk --save
sudo vzctl set XXX --diskspace $(( 1048576*2 )):$(( 1153434*2 )) --save
sudo vzctl set XXX --diskspace 10G:11G --save
vzcfgvalidate /etc/vz/conf/XXX.conf

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Other tricks

sudo vzctl start XXX
sudo vzctl exec XXX passwd
sudo vzctl exec XXX ps aux
sudo vzctl enter XXX
sudo vzctl stop XXX

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Removing a vm

$ sudo vzctl destroy XXX
$ sudo rm /etc/vz/conf/XXX.conf.destroyed

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List running and non-running

sudo vzlist -a

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Memory use

Check memory usage for guest 103

$ sudo vzcalc -v 103

Set minimum memory 256 x memory wanted

$ sudo vzctl set vpsid --vmguarpages $((256 * 256)) --save

Set maximum memory 256 x memory wanted

$ sudo vzctl set vpsid --privvmpages $((256 * 1024)) --save

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References

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